Percussive tool valve



M 1935 H. J. SCHORLE PERCUSSIVE TOOL VALVE 2 Sheets-Sheet 1 Filed Aug. 18, 1934 ladle/201 10 dig INVENTOR ATORNEY Patented May 28, 1935 UNITED STATES PERCUSSIVE PATENT OFFICE TOOL VALVE Herman J. Schorle, Astoria, N. Y., assignor to Worthington Pump and Machinery Corporation, New York, N. 'Y., a corporation of Virginia Application August 18,

' V 10 Claims.

light in weight, positive and quick in action and one which will provide a heavy blow of the hammer piston of the tool andwill cut down the consumption of fluid employed for operating the drill in proportion to the amount of work performed.

A further object of the invention is to provide a valve as specified, which utilizes compression from the cylinder of the tool, through auxiliary ports for throwing the valve from one position to another.

With these and other objects in view as may appear front the accompanying specification, the invention consists of various features of construction and combination of parts, which will be first described in connection with the accompanying drawings, showing a percussive tool valve of the preferred form, and the features forming the invention will be specifically pointed out in the. claims.

In the drawings: 7

Fig. 1 is a longitudinal section through a drill manufactured in accordance with the present invention. 7

Fig. 2 is an enlarged section through the valve chest and valve showing the valve in a reverse position to that in which it is shown in Fig. 1.

Fig. 3 is a detail isometric view of the valve.

Fig. 4 is a longitudinal section through the valve chest showinga modified form of the valve.

Fig. 5 is a side elevation of the modified form of the valve.

Fig. 6 is a longitudinal section through a still further modified form of valve.

Fig. '7 is a side elevation of the modified form of valve shown in Fig. 6.

Referring more particularly to the drawings, an improved percussive tool of the hammer piston type is illustrated which comprises the body I having the cylinder 2 therein in which the hammer piston 3 reciprocates. The hammer piston 3 is of any approved type, and operates the drill steel indicated at 4, by successive blows thereagainst.

The operating fluid, namely compressed air, is admitted initially to the percussive tool or rock drill through the throttle valve 5, and its distribution into the cylinder 2 for controlling and operating the hammer piston 3 is controlled .by a distributing valve 6 in combination with 1934, Serial No. 740,368

the valve chest or valve box I. The distributing valve 6 is substantially cylindrical in shape and is mounted upon the tube-like or cylindrical portion 8 of the section 9 of the valve box, sliding thereon for controlling various ports and passages and consequently controlling the distribution of the operating pressure fluid to the cylinder.

The operating pressure fluid passes from the throttle valve 5 intothe annular air chamber}? in the back head 9' of the drill or tool and when the valve 6 is in the position shown in Fig. 1 of the drawings, the operating pressure fluid passes through the passage it formed in the body I, into the annular chamber II and from the annular chamber ll through the constriction l2 past the central flange I3 on the valve into the annular space or passage 14. Fromthe annular space or passage l l'the operating pressure fluid goes through the passageway l5 and enters the cylinder 2 through the port It for wardlly of the piston 3. The pressure fluid entering the cylinder through the port l6 will force the piston 3 rearwardly. During the rearward movement, of the piston, when it uncovers the port ll some of the pressure fluid Will pass through the port ll into the passageway l8 and from this passageway into the annular space or annular chamber l9. Such pressure fluid acting upon the forward end of the cylindrical valve 6 will move the valve upwardly into the position as shown in Fig. 2 of the drawings at which time the delivery of pressure fluid to the passageway l5 will be cut off and the forward end of the cylinder 2 will be open to atmosphere to permit the exhausting of the pressure fluid therefrom through the passage [5, annular chamber 14, the annular chamber 20 and the exhaust port 2i. The forward end 2! of the cylindrical valve 6 is larger in area than the rearward end 22 providing difierential areas for throwing the valve into its rearward position as shown in Fig. 2. When the valve 6 is in' its rearward position, the operating pressure fluid will pass from the annular chamber H, through the restricted space 23 into the annular chamber 24 and from the annular chamber 24 through a plurality of openings 25 into the rear end of the cylinder 2 rearwardly of the piston 3 and force the piston 3 forwardly. As the piston 3 moves forwardly, it uncovers the port 26 which permits some of the pressure fluid topass from the cylinder 2 through the'passageway 21 into the annular space 28 at the rear end of the valve 6, at whichtime the port [7. is closed, and the exhaust 29 is cut ofi by the valve as clearly shown in Fig. 2 of the drawings. The air pocketed in the passage i8 and chamber 19 bleeds therefrom to atmosphere, through the vent 30 which permits the pressure applied against the rear end 22 of the valve to move the valve forwardly into the position shown in Fig. l of the drawings for delivering the pressure fluid to the forward end of the cylinder. The valve is provided with a plurality of circumferentially spaced ports 3| which open into the annular chamber 56 and into the space 32 which permits pressure fluid to pass through the ports and space 32 into the annular chamber 33 which is formed interiorly of the valve. The provisionof the annular space 32 provides a rearward wall 34 for the annular chamber 33 which is of smaller area than the forward wall 35, thereby providing differential area acted upon .by pressure fluid which compensates for the differences in the.

areas of the ends 2| and 22 of the Valve and holds the valve in its forward position during the required time interval for the delivery of the pressure fluid into the forward end of the cylinder and until the port ll is opened-to the interior of the cylinder and the port 25 cut off, at which time pressure fluid will be delivered through the passage E8 to the annular chamber [9 for moving the valve into its upward position, the pressure being relieved from the annular chamber 33 through the ports 3!, annular chamber 23 and the exhaust port 2|.

The exhaust port 29 communicates with the annular chamber 31 so that when the valve is in its forward position as shown in Fig. 1 the rear end of the cylinder 2 is open to exhaust through the annular chamber 24,. passages 25 and annular chamber 3'! as clearly shown in Fig. 1 of the drawings.

If it is so desired the central flange 13 on the valve 6 may have its corners cut away as shown at 38 to provide accurate control of the area of the restricted openings i2 and 23 to permit accurate control of the delivery of the pressure fluid to the respective ends of the cylinder.

Figs. 4 and 5 show a slight modification of the valve construction, and in this form the central flange 40 formed on the valve body 4! does not have its corners cut away as shown at 38 in Figs. 1 to 3 of the drawings, it depending upon the space between the forward and rear edges of the flange and the adjacent edges indicated at 42 and 43, formed on the valve box 44 for controlling the delivery of air to the ends of the cylinder. The operation of the valve Q0 is the same as the operation of the valve 6 hereinabove described differing only in that the end flanges 45 and 46 of the valve are provided with cutaway portions indicated at 4! which provide vent openings or space to permit the venting of the annular chambers 19' and Z8 through the annular chambers 37' and 2G to the exhaust ports 2! and 29 instead of the provision of the vents 30 and 26' as shown in Fig. l of the drawings.

A still further modified form of the valve structure is shown in Figs. 16 and '7 of the drawings wherein the central flange 5c of the valve 5| is provided with cutaway portions 38 which correspond to the cutaway portions 38 on the valve shown in Figs. 1 to 3 inclusive of the drawings. The valve 5| has the cutaway portions 41' formed on the end flanges 45' and 45 which permits the venting of the chambers to atmosphere through the exhaust 2i and 29 instead of through the vents 25 and 36, it being understood that these latter vents are eliminated in both of the modified forms of valve structure.

In the forms of valve shown in Figs. 1 to 5 inclusive, the area of the forward ends of the valve is greater than the area of the rear ends of the valve so as to provide the differential area for throwing the valve from one position to the other and also the differential areas necessary for holding the valve in adjusted positions during the proper time intervals. The valve shown in Figs. 6 and 7 differs from these valves of Figs. 1 to 5, in that the areas of both the forward and therear end of the valve are the same. To provide for the necessary surfaces for throwing .the valve and holding it in adjusted positions, a second series of openings as shown at 52 are formed in the valve. The opening's 52 open into an annular space 53 formed between the valve and the sleeve 55 which forms a part of the valve chest 55. 53 is terminated at each end by shoulders formed on the sleeve 54 and on the central portion of the valve 50 as clearly shown in Fig. 5 of the drawings. The valve 50 also has the plurality of openings 31 formed therein which co-operate;

a cylinder, a hammer piston in the cylinder, a

valve chest having a valve chamber and a pressure fluid inlet passage, said chest having fluid supply passages leading from said chamber to said cylinder, a valve in said'valve chamber, a central flange on said valve co-operating with adjacent surfaces on the valve chest to provide restricted passages for controlling delivery of pressure fluid to said cylinder, one end of said valve being of greater area than the other end, and a valve-holding area formed internally of said flange and intermittently subjected to pressure for holding the valve in position.

2. In a percussive tool, the combination, of a cylinder, a hammer piston in the cylinder, a valve chest having a valve chamber and a pressure fluid inlet passage, said chest having fluid supply passages leading from said chamber to said cylinder, a' valve in said valve chamber, a central flange on said valve co-operating with adjacent surfaces on the valve chest to provide restricted passages for controlling delivery of pressure fluid to said cylinder, a valve-holding area formed internally of said flange and intermittently subjected to pressure for holding the valve in position, said cylinder provided with exhaust ports, said exhaust ports opening into said valve chest whereby said valve will control exhaust of fluid from the cylinder.

3. In a percussive tool, the combination. of a cylinder, a hammer piston in the cylinder, a valve chest having a valve chamber and a pres- .sure' fluid inlet passage, said chest having fluid supply passages leading from said chamber to said cylinder, a valve in said valve chamber, a

central flange on said valve co-operating with adjacent surfaces on the valve chest to provide restricted passages for controlling delivery of The annular space pressure fluid to said cylinder, a valve-holding area formed internally of said flange and intermittently subjected to pressure for holding the valve in position, valve-throwing areas on said valve, said cylinder having piston-controlled ports and. passages for delivering pres sure against said throwing areas, and means for venting said passages.

4. In a percussive tool, the combination, of a cylinder, a hammer piston in the cylinder, a valve chest having a valve chamber and a pressure fluid inlet passage, said chest having fluid supply passages leading from said chamber to said cylinder, a valve in said valve chamber, a central flange on said valve co-operating with adjacent surfaces on the valve chest to provide restricted passages for controlling delivery of pressure fluid to said cylinder, a valve-holding area formed internally of said flange and intermittently subjected to pressure for holding the valve in position, said cylinder provided with exhaust ports, said exhaust ports opening into said valve chest whereby said valve will control exhaust of fluid from the cylinder, valvethrowing areas on said valve, said cylinder having piston-controlled ports and passages therein for delivering pressure against said throwing areas, and means for venting said passages.

5. In a percussive tool, the combination, of a cylinder, a hammer piston in the cylinder, a valve chest having avalve chamber and a pressure fluid inlet passage, said chest having fluid supply passages leading from said chamber to said cylinder, a valve in said valve chamber, a central flange on said valve co-operating with adjacent surfaces on the valve chest to provide restricted passages for controlling delivery of pressure fluid to said cylinder, a valve-holding area formed internally of said flange and intermittently subjected to pressure for holding the valve in position, said cylinder provided with exhaust ports, said exhaust ports opening into said valve chest whereby said valve will control exhaust of fluid from the cylinder, valve-throw; ing areas on said valve, said cylinder having piston-controlled ports and passages therein for delivering pressure against said throwing areas, said valve provided with cutout portions to vent said passages to said exhaust ports.

6. In a percussive tool, the combination, of a cylinder, a hammer piston in the cylinder, a valve chest having a valve chamber and a pressure fluid inlet passage, said chest having fluid supply passages leading from said chamber to said cylinder, a valve in said valve chamber, a central flange on said valve co-operating with adjacent surfaces on the valve chest to provide restricted passages for controlling delivery of pressure fluid to said cylinder, the ends of said valve having equal area, and a plurality of shoulders formed internally of said valve and co-operating with shoulders formed on said chest, said valve and chest shoulders being intermittently subjected to pressure for holding the valve in position.

"I. In a percussive tool, the combination, of a cylinder, a hammer piston in the cylinder, a valve chest having a valve chamber and a pressure fluid inlet passage, said chest having fluid supply passages leading from said chamber to said cylinder, a valve in said valve chamber, a central flange on said valve co-operating with adjacent surfaces on the valve chest to provide restricted passages for controlling delivery of pressure fluid to said cylinder, the ends of said valve having equal area, and a plurality of shoulders formed internally of said valve and cooperating with shoulders formed on said chest,

said valve and chest shoulders being intermittently subjected to pressure for holding the valve formed internally of said valve and co-operating with shoulders formed on said chest, said valve and chest shoulders being intermittently subjected to pressure for holding the valve in position, said cylinder provided with exhaust ports,

said exhaust ports opening into said valve chest whereby said valve will control exhaust of. fluid from the cylinder, valve-throwing areas on said valve, said cylinder having piston-controlled ports and passages therein for delivering pressure against said throwing areas.

9. ma percussive tool, the combination, of a cylinder, a hammer piston in the cylinder, a valve chest having a valve chamber and a pressure fluid inlet passage, said chest having fluid supply passages leading from said chamber to said cylinder, a valve in said valve chamber, a central flange on said valve co-operating with adjacent surfaces on the valve chest to provide restricted passages for controlling delivery of pressure fluid tosaid cylinder, the ends of said valve having equal area, a plurality of shoulders:

'formed internally of said valve and co-operating with shoulders formed on said chest, said valve and chest shoulders being intermittently subjected to pressure for holding the valve in position, said cylinder provided with exhaust ports, said exhaust ports opening into said valve chest whereby said valve will control exhaust of fluid from the cylinder, valve-throwing areas on said valve, said cylinder having piston-controlled ports and passages therein for delivering pressure against said throwing areas, and said valve provided with cutout portions to vent said passages to said exhaust ports.

10. In a percussive tool, the combination, of a cylinder, a hammer piston in the cylinder, a valve chest having a valve chamber and a pressure fluid inlet passage therein, said chest having fluid supply passagesleading from said chamber to said cylinder, arvalve in said valve chamber, a central flange onsaid valve co-operating with adjacent surfaces on the valve chest to provide restricted passages for controlling delivery of HERMAN J. SCHORLE. 

